A sound concept is paramount to success.
Isn’t that what you drill into your start-ups?
Everything starts with proper reflection, first of your goals upon which you’ll built up a rationale of why you want to do game incubation. It will turn out to be an iterative performance and adaption of the basic approach when the reality of finances, client reaction, environmental opportunities (location, community connections, etc.) sets in. The design of the project driven by its conceptual basis will highly benefit from looking at what other game incubators have done and come up with over the years.